NETs in the spotlight: exploring NETosis markers for tracking disease activity in IgA vasculitis

Area of Science:

• Immunology
• Rheumatology
• Pediatrics

Background:

• Neutrophil extracellular traps (NETs) are increasingly recognized for their role in autoimmune diseases.
• NETosis, the process of NET formation, involves the release of neutrophil components that can contribute to inflammation and tissue damage.
• The specific involvement of NETosis in the pathogenesis of immunoglobulin A vasculitis (IgAV) remains an area of active investigation.

Purpose of the Study:

• To investigate the association between NETosis biomarkers and disease activity in pediatric patients with IgAV.
• To explore the potential of NETosis markers for monitoring IgAV disease phases.

Main Methods:

• A longitudinal study was conducted with 33 pediatric IgAV patients and 26 healthy controls.
• Blood and urine samples were collected during active and inactive disease phases.
• NETosis markers including cell-free DNA (cf-DNA), neutrophil elastase (NE), myeloperoxidase (MPO), and citrullinated histone H3 (cit-H3) were quantified using ELISA.

Main Results:

• Serum cf-DNA levels were significantly higher in patients with active IgAV compared to controls and inactive IgAV patients.
• Urine MPO levels were lower in active IgAV patients than controls, while urine cit-H3 levels were elevated in both active and inactive IgAV phases compared to controls.
• A serum cf-DNA threshold of 935 ng/ml demonstrated 93% sensitivity and 72% specificity for identifying active IgAV.

Conclusions:

• Elevated serum cf-DNA and urinary cit-H3 suggest a role for NETosis in IgAV activity.
• These NETosis markers may serve as potential indicators for monitoring disease activity in IgAV.
• Further research is needed to standardize NETosis marker assessment protocols for IgAV.